So I thought I got the 220k m20 sorted out, but turns out it was too good to be true. I recently just replaced the Throttle Position Switch, as my car was idling really high. She now idles at the proper RPM but I do notice a small stumble or hiccup every few seconds or so when sitting at a stoplight. The RPM does not move but I can hear and feel the car misfiring. Also, when the car is not cold (Could have driven the car 5 mins, not even up to temp) it has a hard time starting. It fires right up in the morning but I will have to crank it for 5-8 seconds for it to finally stumble to life. I don't have much experience with these cars but it smells like its running rich and feels a little down on power possibly? I have replaced every vacuum line and gasket on this engine that has to do with the intake. Could it be a fuel problem or a sensor malfunction? I have done some digging on the internet and it sounds like it could be the fuel pump, filter, or injectors but I'm just not sure. I also adjusted the valves to 0.010 inches myself, but the valvetrain still sounds quite noisy. If you blip the throttle at idle, it will bog down but then try to rev again. Hard to notice when I am driving, however.
Side Note: the spark plugs have also been changed, but the wires are not the right ones for this car. Some brand called Import Direct.
Side Note: the spark plugs have also been changed, but the wires are not the right ones for this car. Some brand called Import Direct.
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